Transmission problem NEED HELP!!
 

Hello everyone. I have a 88 Mk III, N/A, auto-trans, supra. A few months ago i noticed that the car started shifting under 2500 rpm and wouldn't go above that until 5th gear. When i turn off the overdrive it shifts over that but is still sluggish getting up in acceleration. Someone said that it might be that the electrode which controls the torque converter on at higher speeds is stuck on. If this is true where is this electrode and is it inside the transmission or outside? Can someone help me!! Thanks

I would try an engine diagnostic first to make sure you're looking in the right place. If a sensor is crapping out on you ,the computer may already know it.

The 'Torque Convertor Lock-up Solenoid' is inside the trans. If it were stuck "on", and the torque convertor were actually locked, the engine would not idle, as it would be trying to move the car, it would die.

You may have engine running/power loss issues, like a plugged exhaust, for example.

Try to check for codes per the TSRM (see FAQs section, or suprra_girl's signature).

Usually the over drive off light will flash if the computer sees a problem in the trans.